4IFF

Structural organization of FtsB, a transmembrane protein of the bacterial divisome


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.221 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural Organization of FtsB, a Transmembrane Protein of the Bacterial Divisome.

Lapointe, L.M.Taylor, K.C.Subramaniam, S.Khadria, A.Rayment, I.Senes, A.

(2013) Biochemistry 52: 2574-2585

  • DOI: 10.1021/bi400222r
  • Primary Citation of Related Structures:  
    4IFF

  • PubMed Abstract: 
  • We report the first structural analysis of an integral membrane protein of the bacterial divisome. FtsB is a single-pass membrane protein with a periplasmic coiled coil. Its heterologous association with its partner FtsL represents an essential event for the recruitment of the late components to the division site ...

    We report the first structural analysis of an integral membrane protein of the bacterial divisome. FtsB is a single-pass membrane protein with a periplasmic coiled coil. Its heterologous association with its partner FtsL represents an essential event for the recruitment of the late components to the division site. Using a combination of mutagenesis, computational modeling, and X-ray crystallography, we determined that FtsB self-associates, and we investigated its structural organization. We found that the transmembrane domain of FtsB homo-oligomerizes through an evolutionarily conserved interaction interface where a polar residue (Gln 16) plays a critical role through the formation of an interhelical hydrogen bond. The crystal structure of the periplasmic domain, solved as a fusion with Gp7, shows that 30 juxta-membrane amino acids of FtsB form a canonical coiled coil. The presence of conserved Gly residue in the linker region suggests that flexibility between the transmembrane and coiled coil domains is functionally important. We hypothesize that the transmembrane helices of FtsB form a stable dimeric core for its association with FtsL into a higher-order oligomer and that FtsL is required to stabilize the periplasmic domain of FtsB, leading to the formation of a complex that is competent for binding to FtsQ, and to their consequent recruitment to the divisome. The study provides an experimentally validated structural model and identifies point mutations that disrupt association, thereby establishing important groundwork for the functional characterization of FtsB in vivo.


    Organizational Affiliation

    Department of Biochemistry, University of Wisconsin-Madison, 433 Babcock Drive, Madison Wisconsin, 53706, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Fusion of phage phi29 Gp7 protein and Cell division protein FtsB ABCD86Bacillus virus phi29Escherichia coli
This entity is chimeric
Mutation(s): 0 
Gene Names: 7
Find proteins for P0A6S5 (Escherichia coli (strain K12))
Explore P0A6S5 
Go to UniProtKB:  P0A6S5
Find proteins for P13848 (Bacillus phage phi29)
Explore P13848 
Go to UniProtKB:  P13848
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download Ideal Coordinates CCD File 
A, C
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.221 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.577α = 90
b = 87.577β = 90
c = 185.11γ = 120
Software Package:
Software NamePurpose
HKL-3000data collection
PHASERphasing
REFMACrefinement
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-04-10
    Type: Initial release
  • Version 1.1: 2013-05-22
    Changes: Database references
  • Version 1.2: 2017-08-02
    Changes: Refinement description, Source and taxonomy